P0748: How to Diagnose & Fix — Pressure Control Solenoid "A" Electrical
20 vehicles · 11 makes · $150-$6,000 repair
How to diagnose and fix P0748: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Cadillac Escalade · 2002–2006
GMT800-era Escalades use the 4L60E/4L65E four-speed behind the 6.0L LQ9/LQ4, and in a 5,800-pound SUV the 3-4 clutch pack is the component that gives out. The 3-4 clutch apply circuit runs through a small feed and the waved snap ring and clutch plates cook under sustained load - towing, hills, or just the vehicle's weight over time. It usually starts as a flare or slip on the 2-3 shift, then the transmission stops making 3rd and 4th entirely and drives only in 1st and 2nd (or goes to limp with no movement at all). The sun shell ('Beast' shell) splintering is the other classic failure and produces loss of reverse and 2nd/4th. CarComplaints lists 'Transmission Failure' as the #1 problem on both the 2005 Escalade (avg $2,800 at 79,000 mi) and the 2006 Escalade (avg $2,800 at 77,000 mi), which is early-life failure for a truck transmission. This is a separate failure from the later 8L90 and 10-speed shift-quality complaints.
Common Symptoms
- RPM flares on the 2-3 upshift without the vehicle accelerating
- Transmission stops shifting into 3rd and 4th, drives only in low gears
- Loss of reverse along with 2nd and 4th gear
- Burnt-smelling dark transmission fluid and clutch debris on the pan magnet
- Harsh or delayed engagement into Drive or Reverse
How to Fix
Confirm with a scan and a pressure test before pulling anything. P0741 with a slipping torque converter lockup can be a solenoid or converter and does not require a rebuild; P1870 (transmission component slipping) on a 4L60E is the classic signature of the 3-4 clutch and worn valve body bores and does mean internal damage. Check fluid condition - burnt smell and black-brown fluid with clutch material on the pan magnet confirm the clutch pack is gone. Do not do a flush on a slipping unit; it will not save it and can finish it off. The correct repair is a full rebuild with upgraded internals: a 5-pinion or beast-style sun shell, an upgraded 3-4 clutch pack with additional frictions, a hardened input shaft, and a corrected valve body/servo. A rebuild that only replaces the burnt clutches with stock parts will fail again on the same schedule. Budget roughly $2,200-$3,500 for a quality rebuild or a reman unit installed. Adding an auxiliary transmission cooler is worthwhile on any Escalade that tows.
Sources for this issue (2)
Dodge Dakota · 1996–1999
The electronically-modulated 42RE (behind the V6) and 46RE (behind the V8) automatic transmissions, used 1996-1999, rely on a governor pressure solenoid and a governor pressure sensor mounted on the valve body to control shift timing. Heat and mileage fatigue the sensor and cause the solenoid to stick, producing erratic, harsh, or delayed shifts. A failed sensor commonly forces the transmission into limp mode (locked in a single gear). This is a well-known, relatively inexpensive failure often misdiagnosed as a worn-out transmission - Mopar reportedly priced the parts high early on because so many were failing.
Common Symptoms
- Harsh or delayed 1-2 / 2-3 shifts
- No overdrive (4th gear) engagement
- Erratic shift points
- Transmission stuck in one gear (limp mode)
- High RPM flare before a hard 'slam' shift
How to Fix
Replace the governor pressure solenoid and governor pressure sensor as a set (inside the pan on the valve body) and change fluid and filter. This only fixes shift-quality complaints on an otherwise-healthy unit; if fluid is burnt or the transmission is already slipping mechanically, a rebuild is required.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Mopar 4617210 governor-pressure solenoid plus 56041403AA transducer
Replace the failed governor pressure solenoid and sensor together after scan data and hydraulic diagnosis isolate this pair Fitment: Vendor lists 1996-1999 A500/A518 42RE/46RE applications; confirm Dakota transmission tag before purchase…
- Mopar governor-pressure solenoid and transducer set
Alternate exact-year source for the paired repair Fitment: Page is specific to 1996-1999 46RE/47RE-family applications; confirm a 46RE rather than assuming it fits every 3.9L Dakota $229.99 and Add to cart when checked
- 42RE/44RE governor solenoid, sensor, output-speed sensor, filter and gasket service kit
Complete fluid/filter and governor-electronics service branch for the exact transmission subset Fitment: 1998-1999 42RE/44RE only; not a 46RE kit $194.88 and in stock when checked
- Mopar 68218058AC ATF+4 fluid
Approved replacement fluid after the electronic repair and transmission-specific filter service Fitment: Use the service-manual quantity for the exact 42RE/44RE/46RE and repair state Live Mopar direct product page when checked
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Sources for this issue (1)
Dodge Neon · 1995–1999
First-gen Neons with the optional 3-speed automatic (a TorqueFlite-family 31TH/A413 unit) are markedly less durable than the 5-speed manual. Documented failure points include a sticking governor valve (causes high-gear starts/binding), sprag/one-way-clutch failure, and clutch/band failures leading to slipping, harsh or missed shifts, dropping out of gear, and no-reverse conditions. Fluid neglect and the Neon's cooling/heat issues accelerate wear.
Common Symptoms
- Slipping or flaring shifts
- Harsh or skipped shifts
- Starts moving in high gear (sticking governor)
- No reverse / stuck in gear
- Drops out of gear at speed
- Whine or lockup then failure
How to Fix
Service with correct ATF and filter on a strict interval; a governor pressure/bracket-and-spring kit (e.g., Sonnax) addresses the sticking-governor high-gear-start complaint. Slipping/no-reverse or sprag failure typically requires a rebuild or replacement transmission. Adding an auxiliary cooler helps longevity.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Sonnax 32204-03K governor bracket/spring kit
Correct the sticking-governor/high-gear-start branch after diagnosis Fitment: Vendor explicitly lists 1995-2001 Neon 2.0L 3-speed A413/31TH Live direct US transmission-parts product page when checked
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
Volkswagen Jetta · 1999–2005
Chevrolet Avalanche · 2002–2013
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P0748 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0748 mean?
P0748 stands for "Pressure Control Solenoid "A" Electrical." P0748 is a generic powertrain code meaning the transmission control module has detected an electrical fault — voltage or resistance out of the expected range — in the circuit for pressure control solenoid "A". This solenoid regulates hydraulic line pressure inside an automatic transmission, adjusting how firmly the clutches and bands apply based on speed, load, and throttle position. When the computer can't control the solenoid electrically, the transmission often defaults to maximum line pressure or limp mode, so you may feel harsh or erratic shifts, slipping, delayed engagement when shifting into Drive, or being locked into a single gear. Because it is an electrical-circuit code, the fault is usually in the solenoid itself or its wiring rather than a purely hydraulic problem, though contaminated fluid can damage the solenoid. Continuing to drive with slipping and overpressure shifts can overheat the transmission and lead to expensive internal damage, so this should be repaired promptly.
What are the most common causes of P0748?
The most common causes of P0748 are: Failed pressure control solenoid A (open or shorted solenoid windings), Damaged, frayed, or shorted wiring in the solenoid circuit, including the transmission case connector, Corroded or loose electrical connectors at the transmission harness, Low, dirty, or contaminated transmission fluid degrading or sticking the solenoid, Clogged transmission filter or debris in the valve body hydraulic passages, Faulty transmission control module or PCM driver circuit (rare). The specific cause varies by vehicle.
How much does it cost to fix P0748?
Repair costs for P0748 range from $150 to $6,000, depending on the vehicle and root cause.
Which vehicles are affected by P0748?
Au7o has documented P0748 across 20 vehicle models from 11 manufacturers: Cadillac, Chevrolet, Dodge, Ford, GMC, Hyundai, Jaguar, Kia, RAM, Toyota, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.